Cash burn rate is a fundamental financial metric, primarily used by startups and venture-backed companies, to measure the rate at which a company consumes its cash reserves before generating positive cash flow from operations. Understanding how to calculate cash burn rate is vital for determining your "runway"—the amount of time your business has before it runs out of money.
How to Calculate Cash Burn Rate: The Formula
The basic formula for calculating the net burn rate over a specific period is straightforward:
Burn Rate = (Starting Balance – Ending Balance) / Number of Months
Gross Burn vs. Net Burn
Gross Burn: The total amount of operating expenses a company incurs each month (rent, salaries, overhead), regardless of revenue.
Net Burn: The actual amount of money a company is losing each month. It is calculated as (Total Revenue – Total Expenses).
Example Calculation
Metric
Value
Starting Balance (Jan 1)
$200,000
Ending Balance (March 31)
$140,000
Time Period
3 Months
Monthly Burn Rate
$20,000 / month
Runway Remaining
7 Months
Why Monitoring Burn Rate Matters
1. Fundraising Timing: Investors want to see that you have at least 6-12 months of runway. Knowing your burn rate tells you exactly when you need to start your next series of pitches.
2. Resource Allocation: If your burn rate is too high relative to your growth, it signals that you need to cut costs or pivot your strategy.
3. Operational Vitality: It provides a reality check on how sustainable your current business model is without external capital.